A structural warranty inspector is a surveyor employed by a structural warranty provider - most commonly NHBC, Premier Guarantee or LABC Warranty - to inspect new build and conversion projects at key construction stages. The inspections are a condition of issuing a structural warranty (also called a latent defects warranty or new home warranty). Most mortgage lenders require a recognised structural warranty as a condition of lending on new build properties, making the inspector's role central to the process of selling and financing new homes in the UK. The inspection regime checks that the build meets the warranty provider's technical standards and Building Regulations.
What they do
- Carry out stage inspections of new build and conversion projects
- Inspect foundations, drainage, damp proof courses and structural elements
- Verify compliance with the warranty provider's technical requirements
- Issue inspection reports and completion certificates
- Advise builders on remediation of identified defects before sign-off
- Inspect conversions and changes of use requiring structural warranty
- Prepare defect investigation reports post-completion
- Provide structural defect insurance documentation for lender requirements
When you need one
A structural warranty inspector is required whenever a new build or conversion project needs a structural warranty. Most mortgage lenders will not lend on a new build without one.
Typical costs (UK, 2025)
| Service | Typical cost |
|---|---|
| Structural warranty premium (new build house) | £1,500 - £4,000 |
| Stage inspection fees | Included in warranty premium |
| Self-build warranty (per £100k build cost) | £800 - £1,500 |
| Defect investigation report | £400 - £900 |
| Conversion structural warranty | £1,200 - £3,000 |
Warranty premiums vary by build value, complexity, number of plots and the warranty provider. Self-build warranties are typically more expensive per unit than volume developer warranties. Stage inspection fees are included in the premium for most providers.
How to find a reputable structural warranty provider
Frequently asked questions
Do I need a structural warranty for a new build?
Most mortgage lenders require a structural warranty (also called a latent defects warranty or new home warranty) as a condition of lending on new build properties. NHBC Buildmark is the most widely accepted warranty, held by around 80% of new build homes in the UK. Premier Guarantee and LABC Warranty are also widely recognised by mortgage lenders. Without a recognised structural warranty, selling or remortgaging a new build within the warranty period can be very difficult.
How many stage inspections will there be?
Typically 5 to 8 stage inspections from foundation to completion, depending on the complexity of the build. Key stages typically include: foundation inspection, drainage inspection before backfill, damp proof course level, structural frame (for timber frame), roof structure, external envelope before cladding, and pre-plaster. The warranty provider's inspector must be notified to attend each stage - failing to notify can invalidate the warranty.
How long does a structural warranty last?
A standard structural warranty lasts 10 years from practical completion. For NHBC Buildmark, the first 2 years are the builder's responsibility period covering defects in the fabric and services as well as structural defects. Years 3 to 10 cover structural defects only. The warranty transfers with the property on sale, so the remaining term passes to any buyer within the 10-year period.